Can I configure my granularity spec to round __time up?

A community member posed this question, along with the following granularity spec:

"granularitySpec": {
  "segmentGranularity": "day",
  "queryGranularity": "fifteen_minute",
  "rollup": true
}

The answer turns out to be yes. It can be done with the following granularity spec:

"granularitySpec": {
        "type": "uniform",
        "segmentGranularity": "DAY",
        "queryGranularity": "fifteen_minute",
        "rollup": true,
        "intervals": []
      }

If you’re using the web console:

Here’s a bit of context.